WEBVTT 00:00.080 --> 00:06.170 Before we install Ros2, it's important to check which ros2 distribution you need to use, and you can 00:06.170 --> 00:10.640 find a list of all distributions on the official documentation here. 00:10.640 --> 00:16.700 So just in case you can type Ros two distributions on Google or any web browser, and you will find 00:16.700 --> 00:18.920 this distribution page here. 00:19.160 --> 00:21.050 Okay so that's quite easy to find. 00:21.080 --> 00:26.780 So here we have a list of all available ros2 distributions in green. 00:26.780 --> 00:32.930 You have those who are currently supported and in gray or white those who are not supported anymore. 00:32.960 --> 00:39.350 As you can see here, a new distribution is going to be released every year on May 23rd. 00:39.380 --> 00:46.910 Okay, so before it was not the case, but since 2021 you can see May 23rd for each new distribution. 00:46.910 --> 00:52.040 And it's quite easy to know what's the order of the distributions because it simply follows the alphabetical 00:52.040 --> 00:52.610 order. 00:52.640 --> 00:56.930 You can see the first version here after the alpha and beta was added. 00:56.930 --> 00:59.930 So that's a and then b, c d e f. 00:59.930 --> 01:03.290 And now we have for example j with jazzy. 01:03.290 --> 01:09.100 And so from this you know that the next one is going to start with a k and then L etc. also, you can 01:09.100 --> 01:12.820 see for each distribution we have two names. 01:12.850 --> 01:16.180 Okay, but we only really use the first one. 01:16.180 --> 01:20.680 So here for example we're going to name that distribution here Ross two Jesse. 01:20.680 --> 01:25.870 And one of the most important thing to check for a distribution is the EOL date. 01:25.870 --> 01:28.600 And EOL means end of life. 01:28.600 --> 01:32.380 After this date, the distribution will not be supported anymore. 01:32.380 --> 01:35.230 So after that you should preferably not use it. 01:35.260 --> 01:40.180 It doesn't mean it's not going to work, it's just that you won't get any new updates and after the 01:40.180 --> 01:40.930 EOL date. 01:40.960 --> 01:47.230 The second important thing to check is is this distribution an LTS version or not? 01:47.350 --> 01:50.170 LTS means long term support. 01:50.170 --> 01:52.570 So every year you have a new distribution. 01:52.600 --> 01:53.020 All right. 01:53.020 --> 01:57.610 But it alternates between an LTS and a Non-lts version. 01:57.610 --> 02:03.100 An LTS version is going to be supported for five years and can be considered more stable. 02:03.100 --> 02:05.620 You can see, for example, with Ros2 humble. 02:05.620 --> 02:10.030 That was the first LTS version supported for five years with Ros2. 02:10.060 --> 02:14.560 So you can see May 2022 until May 2027. 02:14.560 --> 02:23.710 We also have jazzy 2024 until 2029, and Non-lts versions are going to be supported for only one year 02:23.710 --> 02:24.520 and a half. 02:24.520 --> 02:30.820 As you can see here with Aaron, we have May 2023 until November 2024. 02:30.820 --> 02:34.540 So knowing all that which version to use. 02:34.810 --> 02:41.200 Well, what I do and what I recommend you to do is to use the latest LTS version, provided that its 02:41.200 --> 02:46.150 been released at least for a few months, so it's more stable and contains all the core packages you 02:46.150 --> 02:47.320 need in this case. 02:47.320 --> 02:50.110 For this course we will choose Ros two jazzy. 02:50.140 --> 02:55.330 That will be perfectly fine to start your learning journey, and then when you start to have a few Ros 02:55.330 --> 03:01.480 two projects and a new LTS version is released, then I advise you to well, test this version and see 03:01.480 --> 03:02.890 if everything is working. 03:02.890 --> 03:08.050 But sometimes not everything is going to be available at the beginning, so you may have to wait a few 03:08.050 --> 03:08.590 months. 03:08.590 --> 03:09.280 It depends. 03:09.280 --> 03:15.520 But let's say 3 to 6 months before you port your code to the new Ros two LTS distribution. 03:15.520 --> 03:22.990 Also, I don't recommend working with non-lts versions like Galactic Ion, etc. those are just released 03:22.990 --> 03:25.750 so you can get the latest tools and features. 03:25.750 --> 03:29.200 So it's nice to test stuff, but it may be less stable. 03:29.200 --> 03:33.760 And also all Non-lts versions are only supported for one year and a half. 03:33.760 --> 03:39.400 So if you are learning, if you want stability, or if you want to use Ros2 for an actual real product, 03:39.400 --> 03:43.870 then I advise you to only stick with LTS versions. 03:43.870 --> 03:47.950 And one last thing that is important to pay attention to, and that's going to be helpful for. 03:47.950 --> 03:54.520 The next lesson in this section is which OS version you need for the Ros2 version that you choose. 03:54.520 --> 03:59.830 So let's click on jazzy here for example, and supported platforms. 03:59.830 --> 04:02.230 So in this course we will focus on ubuntu. 04:02.260 --> 04:04.090 That's what I'm going to look at. 04:04.090 --> 04:12.190 And as you can see with Ros2 jazzy, we need to install ubuntu 24.04 for a different ros2 version. 04:12.190 --> 04:19.450 For example, if I go back and I go to humble, which was an older LTS version, you see that it was 04:19.450 --> 04:21.070 ubuntu 22. 04:21.100 --> 04:28.390 Okay, so when you use a different ros2 version, you also have to use a different ubuntu version.